From 01a802a8d66058174a3f0bc1a837fbc796f0a78f Mon Sep 17 00:00:00 2001
From: akmhatey-ai <akmhatey-ai@users.noreply.github.com>
Date: Sat, 16 May 2026 14:28:00 +0200
Subject: [PATCH 1/2] Fix Slack Lists message field response types

---
 .changeset/slack-lists-message-fields.md      |  5 +++
 .../web-api/src/types/request/slackLists.ts   | 41 ++++++++++++++++++-
 .../test/types/methods/slacklists.test-d.ts   | 34 ++++++++++++++-
 3 files changed, 78 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/slack-lists-message-fields.md

diff --git a/.changeset/slack-lists-message-fields.md b/.changeset/slack-lists-message-fields.md
new file mode 100644
index 000000000..b1ae8addc
--- /dev/null
+++ b/.changeset/slack-lists-message-fields.md
@@ -0,0 +1,5 @@
+---
+"@slack/web-api": patch
+---
+
+Correct Slack Lists item message field response typing to accept single and multiple message objects.
diff --git a/packages/web-api/src/types/request/slackLists.ts b/packages/web-api/src/types/request/slackLists.ts
index 21cc8d431..d3b562988 100644
--- a/packages/web-api/src/types/request/slackLists.ts
+++ b/packages/web-api/src/types/request/slackLists.ts
@@ -65,6 +65,25 @@ export interface SlackListsItemFieldMessage {
   message: string[];
 }
 
+/**
+ * @description Message field value returned for Slack Lists items.
+ */
+export interface SlackListsItemMessage {
+  text?: string;
+  ts?: string;
+  user?: string;
+  team?: string;
+  type?: string;
+}
+
+/**
+ * @description Message field returned for Slack Lists items.
+ */
+export interface SlackListsItemFieldMessageResponse {
+  column_id: string;
+  message: SlackListsItemMessage | SlackListsItemMessage[];
+}
+
 /**
  * @description Number field with numeric values.
  */
@@ -153,6 +172,26 @@ export type SlackListsItemField =
   | SlackListsItemFieldTimestamp
   | SlackListsItemFieldUser;
 
+/**
+ * @description Union type of all possible Slack Lists item field types returned by the API.
+ */
+export type SlackListsItemResponseField =
+  | SlackListsItemFieldAttachment
+  | SlackListsItemFieldChannel
+  | SlackListsItemFieldCheckbox
+  | SlackListsItemFieldDate
+  | SlackListsItemFieldEmail
+  | SlackListsItemFieldLink
+  | SlackListsItemFieldMessageResponse
+  | SlackListsItemFieldNumber
+  | SlackListsItemFieldPhone
+  | SlackListsItemFieldRating
+  | SlackListsItemFieldReference
+  | SlackListsItemFieldRichText
+  | SlackListsItemFieldSelect
+  | SlackListsItemFieldTimestamp
+  | SlackListsItemFieldUser;
+
 /**
  * @description Slack Lists item structure.
  */
@@ -180,7 +219,7 @@ export interface SlackListsItem {
   /**
    * @description Array of field data for this item.
    */
-  fields: SlackListsItemField[];
+  fields: SlackListsItemResponseField[];
   /**
    * @description String representation of the last update timestamp.
    */
diff --git a/packages/web-api/test/types/methods/slacklists.test-d.ts b/packages/web-api/test/types/methods/slacklists.test-d.ts
index 0f8a02274..f751479c5 100644
--- a/packages/web-api/test/types/methods/slacklists.test-d.ts
+++ b/packages/web-api/test/types/methods/slacklists.test-d.ts
@@ -1,5 +1,5 @@
 import { expectAssignable, expectError } from 'tsd';
-
+import type { SlackListsItemsListResponse } from '../../../src/types/response/SlackListsItemsListResponse';
 import { WebClient } from '../../../src/WebClient';
 
 const web = new WebClient('TOKEN');
@@ -77,8 +77,15 @@ expectError(web.slackLists.items.create({})); // missing list_id
 expectAssignable<Parameters<typeof web.slackLists.items.create>>([
   {
     list_id: 'L1234567890',
+    initial_fields: [{ column_id: 'Col1234567890', message: ['https://example.slack.com/archives/C123/p123'] }],
   },
 ]);
+expectError(
+  web.slackLists.items.create({
+    list_id: 'L1234567890',
+    initial_fields: [{ column_id: 'Col1234567890', message: { text: 'message objects are only returned by the API' } }],
+  }),
+);
 
 // slackLists.items.delete
 // -- sad path
@@ -159,3 +166,28 @@ expectAssignable<Parameters<typeof web.slackLists.update>>([
     id: 'L1234567890',
   },
 ]);
+
+// slackLists.items.list response fields
+expectAssignable<SlackListsItemsListResponse>({
+  ok: true,
+  items: [
+    {
+      id: 'Rec014K005UQJ',
+      list_id: 'L1234567890',
+      date_created: 1710000000,
+      created_by: 'U01284PCR98',
+      updated_by: 'U01284PCR98',
+      fields: [{ column_id: 'Col014K005UQJ', message: { text: 'hello', ts: '123.456', user: 'U01284PCR98' } }],
+      updated_timestamp: '1710000000.000000',
+    },
+    {
+      id: 'Rec014K005UQK',
+      list_id: 'L1234567890',
+      date_created: 1710000001,
+      created_by: 'U01284PCR98',
+      updated_by: 'U01284PCR98',
+      fields: [{ column_id: 'Col014K005UQJ', message: [{ text: 'first' }, { text: 'second', ts: '123.457' }] }],
+      updated_timestamp: '1710000001.000000',
+    },
+  ],
+});

From 693b837faca968e3b8a8af47defea9d42c00e620 Mon Sep 17 00:00:00 2001
From: akmhatey-ai <akmhatey-ai@users.noreply.github.com>
Date: Sat, 16 May 2026 15:56:05 +0200
Subject: [PATCH 2/2] Retrigger Salesforce CLA check